package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    /**
     * 发送验证码
     * @param phone
     * @param session
     * @return
     */

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号是否合法(直接使用工具类进行校验）
        boolean phoneInvalid = RegexUtils.isPhoneInvalid(phone);
        //2.不合法，直接返回错误信息
        if (phoneInvalid) {
            return  Result.fail("手机号有误，请重新输入！");
        }else{
            //3.合法，生成验证码
            String code = RandomUtil.randomNumbers(6);

            //4.将验证码保存到redis
            stringRedisTemplate.opsForValue().set(RedisConstants.LOGIN_CODE_KEY + phone,
                    code, RedisConstants.LOGIN_CODE_TTL, TimeUnit.MINUTES);


            //5.发送验证码(模拟发送）
            log.debug("验证码发送成功，验证码：{}", code);

            return Result.ok();
        }

    }

    /**
     * 使用短信验证码登录
     * @param loginForm
     * @param session
     * @return
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号有误，请重新输入！");
        }

        //2.校验验证码
        String code = loginForm.getCode();
        /*获取redis中的验证码*/
        String cacheCode = stringRedisTemplate.opsForValue().get(RedisConstants.LOGIN_CODE_KEY + phone);
        if(cacheCode == null || ! cacheCode.equals(code) ){
            //3.不一致，报错
            return Result.fail("验证码错误");
        }

        //4.一致，根据手机号查询用户(select * from tb_user where phone = #{phone};

         /*使用mybatisPlus快速查询*/
        User user = query().eq("phone", phone).one();

        //5.判断用户是否存在
        if(user == null){
            //6.不存在，将用户添加到数据库（注册）
            user = createUserWithPhone(phone);
        }

        //7.将用户信息保存在redis中(隐藏敏感信息）
        /*生成token, 作为用户信息的key*/
        String token = UUID.randomUUID().toString(true);

        /*将用户对象转换为map对象，使用redis的hash存储*/
        UserDTO userDTO = new UserDTO();
        BeanUtils.copyProperties(user, userDTO);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        stringRedisTemplate.opsForHash().putAll(RedisConstants.LOGIN_USER_KEY + token, userMap);
        /*设置token有效期*/
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token, RedisConstants.LOGIN_USER_TTL, TimeUnit.SECONDS);
        //8.返回token
        return Result.ok(token);
    }

    /**
     * 用户登出
     * @return
     */
    @Override
    public Result logout() {
        Set<String> keys = stringRedisTemplate.keys(RedisConstants.LOGIN_USER_KEY + "*");
        stringRedisTemplate.delete(keys);
        log.info("已退出登录");
        return Result.ok();

    }

    @Override
    public Result sign() {
        UserDTO user = UserHolder.getUser();
        Long userId = user.getId();
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        stringRedisTemplate.opsForValue().setBit(key, dayOfMonth - 1, true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //获取本月截止到今天的所有数据(十进制数）
        List<Long> result = stringRedisTemplate.opsForValue().bitField(key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth))
                        .valueAt(0));
        if(result == null || result.isEmpty()){
            return Result.ok(0);
        }
        Long num = result.get(0);
        if(num == null || num == 0){
            return Result.ok(0);
        }
        int count = 0;
        while (true){
            if((num & 1) == 0){
                break;
            }else {
                count++;
            }
            num = num >> 1;
        }
        return Result.ok(count);
    }

    //根据手机号创建用户
    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        //生成随机昵称
        user.setNickName(SystemConstants.USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //使用mybatisPlus保存用户
        save(user);
        return user;
    }
}
